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Number of circular permutations of 15 things taken 5 at a time in one direction is

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a

15P55

b

15 !2

c

15 !5

d

15P510

answer is D.

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Detailed Solution

Number of circular permutations of 15 things taken 5 at a time in one direction is = 15p55×12= 15p510 number of circular permutations of n different things taken r at a time in one direction is =pn,r2r

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Number of circular permutations of 15 things taken 5 at a time in one direction is